adds a zoomBoxEnabled boolean option in Control.Navigation, r=ahocevar, (Closes #2416)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10067 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/Navigation.js

@@ -49,6 +49,12 @@ OpenLayers.Control.Navigation = OpenLayers.Class(OpenLayers.Control, {
      */
     zoomBox: null,
 
+    /**
+     * APIProperty: zoomBoxEnabled
+     * {Boolean} Whether the user can draw a box to zoom
+     */
+    zoomBoxEnabled: true, 
+
     /**
      * APIProperty: zoomWheelEnabled
      * {Boolean} Whether the mousewheel should zoom the map
@@ -129,7 +135,9 @@ OpenLayers.Control.Navigation = OpenLayers.Class(OpenLayers.Control, {
             this.handlers.wheel.activate();
         }    
         this.handlers.click.activate();
-        this.zoomBox.activate();
+        if (this.zoomBoxEnabled) {
+            this.zoomBox.activate();
+        }
         return OpenLayers.Control.prototype.activate.apply(this,arguments);
     },
 
@@ -252,6 +260,24 @@ OpenLayers.Control.Navigation = OpenLayers.Class(OpenLayers.Control, {
         this.wheelChange(evt, delta || -1);
     },
     
+    /**
+     * Method: disableZoomBox
+     */
+    disableZoomBox : function() {
+        this.zoomBoxEnabled = false;
+        this.zoomBox.deactivate();       
+    },
+    
+    /**
+     * Method: enableZoomBox
+     */
+    enableZoomBox : function() {
+        this.zoomBoxEnabled = true;
+        if (this.active) {
+            this.zoomBox.activate();
+        }    
+    },
+    
     /**
      * Method: disableZoomWheel
      */